Improved compound for the manufacture of illuminating-gas



me is mineral oil.

UNITED STATES PATENT OFFICE.

' GEORGE MCKENZIE, 0 GLASGOW, soorLANfi.

IMPROVED COMPOUND FOR THE MANUFACTURE OF ILLUMINATING-GAS.

8peeification forming part of Letters Patent No. 100,433, dated March 1,1870.

To all whom it may concern.-

Be it known that I, GEORGE MCKENZIE, of

. Glasgow, Scotland, have invented a new and useful Compound for theManufacture of Illuminating-Gas, of which thefollowing is aspeciiication.

were issued to me, numbered 66,511, for a compound for a purpose similarto the one stated above. That was also a compound of pulverized coal andoil; but'the oil to which the literal construction of the language ofthe specification annexed to that patent would limit Since obtainingthat patent I have ascertained by experiment that other oils besidemineral will serve'the purpose, and I therefore desire and intend inthis specification to cover and extend my claim to serve the intendedpurpose so far as relates to enriching the illuminatinggas-producingqualities of coal is concerned; but practically aconsiderable number of them are too costly to enable them to beeconomically used. The oil from rosin and the residuum named will oftenbe found sufficiently cheap and abundant to render their use for thepurpose indicated practicable. The method of combiningpulverized coalwith these substancesis substantially the same as that described in thepatent referred I to for compounding it with mineral oil. The coal is tobe first ground in a suitable mill, and then the non-mineral oil oroleaginous substance is to be ultimately incorporated with it byregrinding or in some other suitable man- I The proportions ofoleaginous substance and coal will vary according to the quality of eachand the degree of illuminating-power required in the gas to be made fromthe compound. I have found that when about thirty gallons of rosin-oilis mixed with a ton of pulverized coal it will raise theilluminating-power of the gas someten or twelve candles. It will usuallybe found that the incorporation will be most readily and easily effectedwith theoil when the oil and coal are both heated sufficiently to keepthe oil in a very completely fluid state during the operation. Topreserve the required fluidity of these oils, it will be found that asmall quantity of some of the lighter mineral oils or their extracts canbe mixed with the non-mineral oily substances to advantage, and rosinmaybe dissolved in some suitable solvent instead of being distilled,ifipret'erred. I prefer however, to use the non-mineral oil in a hotstate, as it then more readily combines with the pulverized coal. Themore thoroughly the coal and oil are incorporated together the moreregularly the compound gives offits gas in the process of distillationin the gas-retort, as the coal will not, if thoroughly combined with theoil, let go the gas from the oil until it is itself also carbonized.

I do not intend to limit myself to any particular nonmineral oil, nor toany special method of incorporatingthe oil and pulverized coal.

What I do claim, and desire to secure by Let.- ters Patent, is-- Thecompound composed of pulverized coal and a non-mineral oleaginoussubstance, substantially as and for the purpose specified.

GEORGE MCKENZIE.

Witnesses:

J. P. FrrcH, THOS. A. MAsrEasoN.

